A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.nlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity.
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S Wave. An S (Secondary) wave, or shear wave, is a seismic body wave that shakes the ground back and forth perpendicular to the direction the wave is moving. It is one of two types of body waves. The other type is the P wave.n a seismogram, the earthquake origin time can be determined by the P wave arrival. P Wave. P (Primary) waves are a type of body wave. A body wave is a seismic wave that moves through the interior of the Earth, as opposed to surface waves that travel near the Earth's surface.